基于交替投影的多参数联合解调算法

Multi-parameter Joint Demodulation Algorithm Based on Alternating Projection

针对卫星统一S频段测控体制中的遥测副载波解调问题,给出了基于交替投影的符号检测与载波相位联合估计处理结构。对传统最佳接收算法中将参数估计和符号检测分别进行最优化处理,没有得到全局联合最优解的问题进行研究,提出了一种基于交替投影的多参数全局联合处理算法。与传统最佳接收算法中先通过非数据辅助方法估计载波相位之后再进行符号检测相比,性能有明显提升,通过简单的迭代结构逼近联合最大似然解。仿真结果表明,上述算法可有效提升联合检测性能。

Aiming at the TT＆amp;C satellite telemetry subcarrier demodulation problem, this paper gives the joint estimation processing structure of symbol detection and carrier phase based on alternating projection. In the traditional optimum reception algorithm,parameter estimation and symbol detection will be optimized separately,which cannot give a global joint optimal solution.This paper studies this problem,and proposes a joint global multi-parameter processing algorithm based on alternating projection.Simulation results show that this algorithm outperforms the traditional optimum reception algorithm in which the carrier phase is estimated using the non-data-aided method before symbol detection.The proposed algorithm can achieve the performance of pilot assisted symbol detection, and can effectively enhance the performance of joint detection.